• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.165-166
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• 2018

The main focus of this study is the analysis of the importance of the planning work of apartment housing projects. Group the detailed work of the facility into five major tasks, categorize each into five major categories, organize the construction plans (P1 through P 6), name the plans (C4), and analyze the quality of the environmental management plans (E1 through E 4) Finally, this study derived major planning tasks from the correlation between planning and cost metrics and from the T-test.

• Journal of Korean Institute of Industrial Engineers
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• v.33 no.1
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• pp.76-85
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• 2007

A reliability acceptance sampling plan (RASP) consists of a set of life test procedures and rules for eitheraccepting or rejecting a collection of items based on the sampled lifetime data. Most of the existing RASPs areconcerned with the case where test items are available at the same time. However, as in the early stage ofproduct development, it may be difficult to secure test items at the same time. In such a case, it is inevitable toconduct a life test using sequentially supplied samples.In this paper, it is assumed that test items are sequentially supplied, the lifetimes of test items follow anexponential disthbution, failures are monitored continuously, arrival times of test items are known, and thenumber of test items at each arrival time is given. Under these assumptions, RASPs are developed by deter-mining the test completion time and the critical value for the maximum likelihood estimator of the mean lifetimesuch that the producer and consumer risks are satisfied. Then, the developed plans are compared to thetraditional Type-I censored RASPs in terms of the test completion time. Computational results indicate that thetest completion time of the developed RASP is shorter than that of the traditional Type-I censored plan in mostcases considered. It is also found that the superiority of the developed RASP becomes more prominent as theinter-arrival times of test items increase and/or the total number of test items gets larger.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.2
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• pp.90-97
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• 2002

In this paper we study the performance test items and improvement plans of surge protective devices for low-voltage power circuits used in railway system. Above of all, the sources of electromagnetic interference in railway system are researched. And then we compared domestic railway standard with IEC and IEEE standards far the test items and methodologies of surge protective devices. Through the investigations, we found that the domestic standard is behind in the number of test items and methods on surge protective devices. As the countermeasures, we suggest removing component tests of surge protective devices, separating standards for power and signal standards, and using international surge waveform. In applying to domestic railway surge protective devices, surge limiting voltage measuring and surge endurance tests by international standard methods are good result.

• Journal of the Korean Society for Railway
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• v.11 no.3
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• pp.233-239
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• 2008

It is very important to set a reliability target and verify the requirement when procuring the rolling stock in the aspect of safety, availability and LCC. While there are a few different methods to verify the reliability target, it is required that the most appropriate method should be used considering the characteristics of rolling stock itself and the operation environment. Even though recently the quantitative reliability requirements are widely adopted in domestic market, there is no substantial contents in the various standards and guidelines. In this study we investigate the various reliability demonstration test plans and evaluate them for rolling stock application. And three test plans among them were applied to the real operation data.

• Journal of Auto-vehicle Safety Association
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• v.9 no.2
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• pp.20-25
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• 2017

KNCAP is a program to evaluate the automobile safety, providing consumer vehicle safety assessment results. The safety evaluation tests are Frontal Impact, Offset Frontal Crash, Side Crash, Side Pole Crash, Rear Impact. This is the study of the offset frontal impact safety evaluation. Currently, IIHS is performing a small overlap test. NHTSA plans to implement the oblique moving deformable barrier test. Euro-NCAP plans to implement a mobile frontal impact test. Simulation is used to compare occupant behavior and injury. We have investigated whether the introduction of the test at KNCAP is necessary. The dummy model used in the simulation was the 50th percentile male Hybrid III dummy.

• Korean journal of applied entomology
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• v.48 no.1
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• pp.45-51
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• 2009

This paper presents sequential sampling plans for evaluating the pest density based on complete counts from probe in a rice storage warehouse. Both maize weevil and Indian meal moth population showed negative binomial dispersion patterns in brown rice storage. For cost-effective monitoring and action decision making system, sequential sampling plans by using the sequential probability ratio test (SPRT) were developed for the maize weevil and Indian meal moth in warehouses with 0.8 M/T storage bags. The action threshold for the two insect pests was estimated to 5 insects per kg, which was projected by a matrix model. The results show that, using SPRT methods, managers can make decisions using only 20 probe with a minimum risk of incorrect assessment.

• Journal of Korean Academy of Nursing
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• v.47 no.5
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• pp.613-623
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• 2017

Purpose: This study was conducted to identify the effects of education regarding action plans according to a self-monitoring program on self-management adherence, knowledge, symptom control, and health-related quality of life (HRQoL) among adults with asthma. Methods: Thirty-four patients were randomly assigned to the intervention group and thirty-two to the control group in this study. A tailored 50-minute intervention based on the contents of self-monitoring and action plans developed by the National Heart Lung and Blood Institute was provided to the intervention group. Structured and well developed questionnaires were used to measure the dependent variables. Results: There were no differences in all general and clinical characteristics, and the dependent variables between two groups in the pre-test. In the post-test, there were differences in the level of self-management adherence (t=4.41, p<.001), knowledge (t=2.26, p=.027), symptom control (t=-2.56, p=.013), and total HRQoL (t=2.14, p=.036) between the two groups, although there was a difference only in the sub-domain of emotion (t=2.03, p=.047) in HRQoL. Conclusion: This study found that action plans according to self-monitoring that enhance a participatory interaction in the treatment and care could help patients with moderate to severe asthma to engagead equately in self-care, to control their symptoms, and to improve their HRQoL. Further studies are still needed to identify longitudinal effects of this program.

• Journal of Radiation Protection and Research
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• v.44 no.1
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• pp.32-42
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• 2019

Background: There have been much efforts to develop the proper and realistic machine Quality Assurance (QA) reflecting on real Volumetric Modulated Arc Therapy (VMAT) plan. In this work we propose and test a special VMAT plan of plan-class specific (pcsr) QA, as a machine QA so that it might be a good solution to supplement weak point of present machine QA to make it more realistic for VMAT treatment. Materials and Methods: We divided human body into 5 treatment sites: brain, head and neck, chest, abdomen, and pelvis. One plan for each treatment site was selected from real VMAT cases and contours were mapped into the computational human phantom where the same plan as real VMAT plan was created and called plan-class specific reference (pcsr) QA plan. We delivered this pcsr QA plan on a daily basis over the full research period and tracked how much MLC movement and dosimetric error occurred in regular delivery. Several real patients under treatments were also tracked to test the usefulness of pcsr QA through comparisons between them. We used dynalog file viewer (DFV) and Dynalog file to analyze position and speed of individual MLC leaf. The gamma pass rate from portal dosimetry for different gamma criteria was analyzed to evaluate analyze dosimetric accuracy. Results and Discussion: The maxRMS of MLC position error for all plans were all within the tolerance limit of < 0.35 cm and the positional variation of maxPEs for both pcsr and real plans were observed very stable over the research session. Daily variations of maxRMS of MLC speed error and gamma pass rate for real VMAT plans were observed very comparable to those in their pcsr plans in good acceptable fluctuation. Conclusion: We believe that the newly proposed pcsr QA would be useful and helpful to predict the mid-term quality of real VMAT treatment delivery.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.19 no.40
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• pp.179-186
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• 1996

Previous researches on optimum ALT plans have shown how to find optimum allocation, lowest stress and sample size subject to minimizing the variance of mean life estimate. Those researches have assumed the censoring time constant. But under certain circumstances such assumptions may not be reasonable. In this paper the constraint on constant censoring time is relaxed, and censoring time is considered variable. If all other test parameters remain unvaried, the variance of the mean life estimate reciprocally increases of the censoring time. This idea in this paper extends to the optimum censoring time. Thus, this paper presents the optimal censoring time in such situations, and finds the optimal lowest stress and allocation based on that optimal censoring time.

• Research in Community and Public Health Nursing
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• v.28 no.4
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• pp.504-512
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• 2017

Purpose: This study aims to investigate the effects of atopic dermatitis on suicidal ideation, plans and attempts in young adult. Methods: Data are from the Sixth Korean National Health and Nutrition Examination Survey (KNHANES VI, 2013, 2015) in a sample of 2,983 respondents aged 19 to 39 years. Data were analyzed using Frequency, Percentage, $x^2$ test, Complex sample multivariate binary logistic regression analysis with SPSS version 18.0 software. Results: Firstly, factors affecting suicidal ideation are gender, education level, smoking, self-reported health status, asthma, depression and stress perception. Factors affecting suicidal plan are education level, self-reported health status, asthma and depression. Lastly, factors affecting suicidal attempt are gender, education level, smoking, self-reported health status, depression and stress perception. Compared to non-atopic group, the prevalence of suicidal ideation and plan of atopic group increased from odds ratio 2.14 to 2.48 and 1.90 to 2.50, respectively. Odds ratio for suicidal attempt was odds ratio 2.69 (10% error level). Conclusion: The results show that atopic dermatitis in young adult affects suicidal ideation, plans and attempts. Therefore, it is necessary to identify atopic patients who have suicidal thoughts and plans and develop an intervention program to prevent and manage suicide in young adult.